Icon for a portion of a display screen



FIG. 1 is a front view of an icon for a portion of a display screen, according to the new design; and,

FIG. 2 is a front view of a second embodiment thereof.

The broken line showing of the portion of a display screen in the Figures is for illustrative purposes only and forms no part of the claimed design.

The broken line showing in both views of the element within the icon and the unshaded area within it forms no part of the claimed design. 

The ornamental design for an icon for a portion of a display screen, as shown and described. 